[Steve Davis]

I would probably try it both ways. I'm not an expert on this but the way I understand it, with push-pull output, if there is any ripple on the B+ it is canceled out in the primary of the output transformer. With a single ended output, they add the bucker coil to produce a signal 180 degrees out of phase to cancel the hum. Now, what I'm thinking is, with a push-pull output, with a bucker coil, the hum would be canceled in the primary of the output transformer, then you would add this 180 degree out of phase signal that would create the hum again. 

Steve